US20140096947A1 - Cutting and Pulling Tool with Double Acting Hydraulic Piston - Google Patents

Cutting and Pulling Tool with Double Acting Hydraulic Piston Download PDF

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Publication number
US20140096947A1
US20140096947A1 US13/645,118 US201213645118A US2014096947A1 US 20140096947 A1 US20140096947 A1 US 20140096947A1 US 201213645118 A US201213645118 A US 201213645118A US 2014096947 A1 US2014096947 A1 US 2014096947A1
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Prior art keywords
piston
passage
mandrel
blade assembly
blade
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Granted
Application number
US13/645,118
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US9366101B2 (en
Inventor
Robbie B. Colbert
Randall L. Hebert
Joshua C. Joerg
Mary L. Laird
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Baker Hughes Holdings LLC
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Baker Hughes Inc
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Priority to US13/645,118 priority Critical patent/US9366101B2/en
Assigned to BAKER HUGHES INCORPORATED reassignment BAKER HUGHES INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOERG, JOSHUA C., COLBERT, ROBBIE B., HEBERT, RANDALL L., LAIRD, MARY L.
Priority to PCT/US2013/062326 priority patent/WO2014055364A1/en
Publication of US20140096947A1 publication Critical patent/US20140096947A1/en
Priority to US14/504,995 priority patent/US9725977B2/en
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Publication of US9366101B2 publication Critical patent/US9366101B2/en
Assigned to BAKER HUGHES, A GE COMPANY, LLC reassignment BAKER HUGHES, A GE COMPANY, LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BAKER HUGHES INCORPORATED
Assigned to BAKER HUGHES HOLDINGS LLC reassignment BAKER HUGHES HOLDINGS LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BAKER HUGHES, A GE COMPANY, LLC
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E21B29/005—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means

Definitions

  • the field of the invention is cutting a pulling tools and more particularly tools that extend a cutter blade by rotation about a fixed pivot location to a flush support for the blade in an extended position so that the string above the cut can be raised for support from a rig floor to allow retraction of the blade and cutter removal through the cut tubular.
  • the present invention addresses several issues in the prior design and presents a more reliable and economical design.
  • the actuating piston is flow actuated to shift and extend the cutting blades and to retain the extended blade position even after the flow is cut off.
  • the blades are retracted with pressure on a landed plug on the piston so that a return spring is not required.
  • the reverse movement of the piston shears out the body lock ring that had previously held the piston on the blade extended position.
  • the adjacent housing squarely supports the blades that are extended radially so as to better support the cut string with reduced stress on the blades as the cut string is raised up to the point where it can be supported from slips on the rig floor so that the blades can be retracted after slacking off weight and pressuring up against a bumped plug on top of the piston.
  • a cutting and pulling tool has a piston responsive to flow therethrough with an orifice to create backpressure to drive the piston uphole to rotate the blades outwardly such as in an expanded section of tubular below a transition from a smaller tubular dimension.
  • the extended cutters are pulled to the transition and an overpull determines that the desired location has been reached.
  • the overpull force is removed and fluid flow and rotation is commenced to cut.
  • the blades extend to a position perpendicular to the tool axis so that they are supported off a radial housing surface as the weight of the cut string above is supported on the blades.
  • the string is pulled up and supported with slips on a rig floor at which point weight is slacked off and a plug is landed in the top of the piston to push it down to remove the tool.
  • FIG. 1 is a section view of the cutting and pulling tool shown in the run in position
  • FIG. 2 is the view of FIG. 1 with the tool now in the blades extended position
  • FIG. 3 is the view of FIG. 2 with the tool now in the cutting position
  • FIG. 4 is the view of FIG. 3 with the tool now in the severed string supporting position
  • FIG. 5 is the view of FIG. 4 with the tool now in the blades retracted position and the severed string independently supported at a surface location.
  • the cutting and pulling tool 10 has a top sub 12 with thread 14 to which is attached a work string that is not shown that extends to a well surface also not shown.
  • a body 16 below the top sub 12 is a body 16 that has a centralizer assembly 18 on the outside and a piston assembly 20 internally in passage 22 that starts at thread 14 and continues into the bottom sub 24 . Additional tools can be attached at thread 26 as needed.
  • a plurality of pivoting blade assemblies 28 are preferably arranged at 120 degree spacing for a total of three although other spacing and blade counts can be used.
  • Each blade assembly has a fixed pivot axis about a pin 30 .
  • Each blade has an arcuate cutting edge 32 with opposed parallel surfaces 34 and 36 flanking the cutting edge 32 as better seen in FIG. 4 .
  • the blades 28 are disposed in adjacent windows 38 in the body 16 with only a single blade assembly 28 visible in FIG. 1 .
  • Each blade assembly 28 has an actuation tab 40 extending in a generally opposite direction than the cutting edge 32 and extending from an opposite side of the pivot pin 30 . The tab 40 extends into groove 42 on piston assembly 20 .
  • Piston assembly 20 has a portion of through passage 22 and a peripheral seal 44 which defines a variable volume chamber 46 .
  • a restriction or orifice 48 is disposed in the bottom sub 24 such that when fluid is pumped at a predetermined rate through passage 22 a backpressure is created behind the orifice 48 that affects the chamber 46 and drives the piston assembly 20 in an uphole direction toward the left end of FIG. 1 .
  • Such movement takes with it the recess 42 which has the effect of rotating the blade assemblies 28 clockwise about pins 30 so that the cutting edge 32 can extend outwardly to approximately a 90 degree orientation to the passage 22 as illustrated in FIG. 2 .
  • the blade assemblies 28 are actuated outwardly in a larger tubular portion 50 that has been expanded relative to the unexpanded portion 52 that is above with a transition 54 in between which is where the cut is to take place. As shown in FIG. 2 the blade assemblies 28 are preferably extended below the transition 54 as a result of backpressure caused by orifice 48 that drives the piston assembly 20 as the chamber 46 increases in volume while the chamber 56 decreases in volume as well fluids are displaced from body 16 through passage 58 that leads out from chamber 56 .
  • a ratchet ring 60 is held in place by one or more shear pins 62 and movement of the piston assembly 20 allows a mating ratchet surface 64 on piston assembly 20 to engage the ratchet or lock ring 60 so that the movement of the piston assembly from the FIG. 1 to the FIG. 2 position cannot be reversed as long as the shear pin or pins 62 remain intact.
  • the flow through passage 22 is cut off and the blade assemblies 28 remain extended as shown.
  • the tool is picked up to get the blades against the transition 54 as shown in FIG. 3 .
  • An overpull force can be applied to make sure at the surface that the blade assemblies are at the right location. Thereafter the overpull force is reduced to a minimal level and the circulation and rotation from the surface or with a downhole motor can take place to make the cut as shown in FIG. 4 .
  • the severed segment 52 lands on surface 34 with parallel surface 36 landing on the bottom of the window 66 as shown in FIG. 4 .
  • the severed segment 52 can be lifted to the point where its top end is at the rig floor where slips can be inserted in the rotary table to support the segment 52 .
  • the tool 10 can be slacked off and a plug 68 can be landed in the top of the piston assembly 20 to block the passage 22 so that pressure then applied above the plug 68 breaks the shear pin 62 thus defeating the locking between surfaces 62 and 64 and pushing the piston assembly 20 in a downward direction which then rotates the blade assemblies 28 to a retracted position as shown in FIG. 5 .
  • the tool 10 can then pulled from the well.
  • the piston is actuated with fluid flow to extend the blades but the flow need not be maintained to keep the blades extended as a lock ring selectively holds the blades extended to make the cut.
  • Reverse piston movement occurs preferably with a dropped plug into the passage in the piston followed by pressuring up to break the shear pin or pins on the lock ring or rings so that the blade assemblies are retracted with piston movement in the downhole direction.
  • the blades finish the cut the blades are extended approximately 90 degrees to the axis of the tool so that the severed tubular string lands squarely on a radially oriented surface while the window associated with each blade assembly has a radial bottom surface on which a flat surface on the blade assembly bottoms lands so that the loading on the blade assemblies is in the axial direction with little if any radial loading component.

Abstract

A cutting and pulling tool has a piston responsive to flow therethrough with an orifice to create backpressure to drive the piston uphole to rotate the blades outwardly such as in an expanded section of tubular below a transition from a smaller tubular dimension. The extended cutters are pulled to the transition and an overpull determines that the desired location has been reached. The overpull force is removed and fluid flow and rotation is commenced to cut. The blades extend to a position perpendicular to the tool axis so that they are supported off a radial housing surface as the weight of the cut string above is supported on the blades. The string is pulled up and supported with slips on a rig floor at which point weight is slacked off and a plug is landed in the top of the piston to push it down to remove the tool.

Description

    FIELD OF THE INVENTION
  • The field of the invention is cutting a pulling tools and more particularly tools that extend a cutter blade by rotation about a fixed pivot location to a flush support for the blade in an extended position so that the string above the cut can be raised for support from a rig floor to allow retraction of the blade and cutter removal through the cut tubular.
    • BACKGROUND OF THE INVENTION
  • Cutting tools in the past were run with spears so that the cut tubular string could be retained by the spear and then pulled out of the hole. The cutter designs were variable and many included blades that extend by sliding down a ramp and turning about a pivot that was driven by a piston that was fluid driven and a spring to retract the blades. Some examples of such designs are U.S. Pat. Nos. 5,791,409; 2,136,518 and 2,167,739. Other styles for cutting tubular strings are illustrated in U.S. Pat. Nos. 7,823,632; 5,018,580; 4,856,642 and 5,014,780.
  • The present invention addresses several issues in the prior design and presents a more reliable and economical design. The actuating piston is flow actuated to shift and extend the cutting blades and to retain the extended blade position even after the flow is cut off. The blades are retracted with pressure on a landed plug on the piston so that a return spring is not required. The reverse movement of the piston shears out the body lock ring that had previously held the piston on the blade extended position. When the blades get through the wall of the tubular string being cut the adjacent housing squarely supports the blades that are extended radially so as to better support the cut string with reduced stress on the blades as the cut string is raised up to the point where it can be supported from slips on the rig floor so that the blades can be retracted after slacking off weight and pressuring up against a bumped plug on top of the piston. These and other features will be more readily apparent to those skilled in the art from a review of the description of the preferred embodiment and the associated drawings while recognizing that the full scope of the invention is to be found in the appended claims.
    • SUMMARY OF THE INVENTION
  • A cutting and pulling tool has a piston responsive to flow therethrough with an orifice to create backpressure to drive the piston uphole to rotate the blades outwardly such as in an expanded section of tubular below a transition from a smaller tubular dimension. The extended cutters are pulled to the transition and an overpull determines that the desired location has been reached. The overpull force is removed and fluid flow and rotation is commenced to cut. The blades extend to a position perpendicular to the tool axis so that they are supported off a radial housing surface as the weight of the cut string above is supported on the blades. The string is pulled up and supported with slips on a rig floor at which point weight is slacked off and a plug is landed in the top of the piston to push it down to remove the tool.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a section view of the cutting and pulling tool shown in the run in position;
  • FIG. 2 is the view of FIG. 1 with the tool now in the blades extended position;
  • FIG. 3 is the view of FIG. 2 with the tool now in the cutting position;
  • FIG. 4 is the view of FIG. 3 with the tool now in the severed string supporting position; and
  • FIG. 5 is the view of FIG. 4 with the tool now in the blades retracted position and the severed string independently supported at a surface location.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The cutting and pulling tool 10 has a top sub 12 with thread 14 to which is attached a work string that is not shown that extends to a well surface also not shown. Below the top sub 12 is a body 16 that has a centralizer assembly 18 on the outside and a piston assembly 20 internally in passage 22 that starts at thread 14 and continues into the bottom sub 24. Additional tools can be attached at thread 26 as needed.
  • A plurality of pivoting blade assemblies 28 are preferably arranged at 120 degree spacing for a total of three although other spacing and blade counts can be used. Each blade assembly has a fixed pivot axis about a pin 30. Each blade has an arcuate cutting edge 32 with opposed parallel surfaces 34 and 36 flanking the cutting edge 32 as better seen in FIG. 4. For running in as shown in FIG. 1 the blades 28 are disposed in adjacent windows 38 in the body 16 with only a single blade assembly 28 visible in FIG. 1. Each blade assembly 28 has an actuation tab 40 extending in a generally opposite direction than the cutting edge 32 and extending from an opposite side of the pivot pin 30. The tab 40 extends into groove 42 on piston assembly 20. Piston assembly 20 has a portion of through passage 22 and a peripheral seal 44 which defines a variable volume chamber 46. A restriction or orifice 48 is disposed in the bottom sub 24 such that when fluid is pumped at a predetermined rate through passage 22 a backpressure is created behind the orifice 48 that affects the chamber 46 and drives the piston assembly 20 in an uphole direction toward the left end of FIG. 1. Such movement takes with it the recess 42 which has the effect of rotating the blade assemblies 28 clockwise about pins 30 so that the cutting edge 32 can extend outwardly to approximately a 90 degree orientation to the passage 22 as illustrated in FIG. 2.
  • It should be noted that in the preferred application the blade assemblies 28 are actuated outwardly in a larger tubular portion 50 that has been expanded relative to the unexpanded portion 52 that is above with a transition 54 in between which is where the cut is to take place. As shown in FIG. 2 the blade assemblies 28 are preferably extended below the transition 54 as a result of backpressure caused by orifice 48 that drives the piston assembly 20 as the chamber 46 increases in volume while the chamber 56 decreases in volume as well fluids are displaced from body 16 through passage 58 that leads out from chamber 56. A ratchet ring 60 is held in place by one or more shear pins 62 and movement of the piston assembly 20 allows a mating ratchet surface 64 on piston assembly 20 to engage the ratchet or lock ring 60 so that the movement of the piston assembly from the FIG. 1 to the FIG. 2 position cannot be reversed as long as the shear pin or pins 62 remain intact.
  • Once the FIG. 2 position is obtained, the flow through passage 22 is cut off and the blade assemblies 28 remain extended as shown. The tool is picked up to get the blades against the transition 54 as shown in FIG. 3. An overpull force can be applied to make sure at the surface that the blade assemblies are at the right location. Thereafter the overpull force is reduced to a minimal level and the circulation and rotation from the surface or with a downhole motor can take place to make the cut as shown in FIG. 4. As a result the severed segment 52 lands on surface 34 with parallel surface 36 landing on the bottom of the window 66 as shown in FIG. 4. At this point the severed segment 52 can be lifted to the point where its top end is at the rig floor where slips can be inserted in the rotary table to support the segment 52. Once that happens, the tool 10 can be slacked off and a plug 68 can be landed in the top of the piston assembly 20 to block the passage 22 so that pressure then applied above the plug 68 breaks the shear pin 62 thus defeating the locking between surfaces 62 and 64 and pushing the piston assembly 20 in a downward direction which then rotates the blade assemblies 28 to a retracted position as shown in FIG. 5. The tool 10 can then pulled from the well.
  • Those skilled in the art will appreciate the various advantages of the present invention. The piston is actuated with fluid flow to extend the blades but the flow need not be maintained to keep the blades extended as a lock ring selectively holds the blades extended to make the cut. There is no return spring. Reverse piston movement occurs preferably with a dropped plug into the passage in the piston followed by pressuring up to break the shear pin or pins on the lock ring or rings so that the blade assemblies are retracted with piston movement in the downhole direction. By the time the blade assemblies finish the cut the blades are extended approximately 90 degrees to the axis of the tool so that the severed tubular string lands squarely on a radially oriented surface while the window associated with each blade assembly has a radial bottom surface on which a flat surface on the blade assembly bottoms lands so that the loading on the blade assemblies is in the axial direction with little if any radial loading component.
  • The above description is illustrative of the preferred embodiment and many modifications may be made by those skilled in the art without departing from the invention whose scope is to be determined from the literal and equivalent scope of the claims below:

Claims (20)

We claim:
1. A cut and pull apparatus for a subterranean tubular comprising:
a mandrel having a mandrel passage therethrough;
a piston movably mounted to said mandrel;
at least one blade assembly responsive to piston movement for extension and retraction with respect to the subterranean tubular for respectively cutting the tubular and removal of a severed segment of the tubular and for subsequent removal of the apparatus;
said blade assembly remaining selectively extended by virtue of a locking assembly that holds a position of said piston after initial movement of said piston.
2. The apparatus of claim 1, wherein:
said piston has a passage therethrough and is driven in a first direction for extension of said blade assembly by flow through said passage.
3. The apparatus of claim 1, wherein:
initial movement of said piston triggers said locking assembly to prevent reverse movement of said piston.
4. The apparatus of claim 1, wherein:
said piston is moved in a first direction so that said blade assembly is extended by flow through a piston passage that is in flow communication with said mandrel passage, said mandrel further comprising a flow restriction to create back pressure against a lower end of said piston.
5. The apparatus of claim 1, wherein:
said blade assembly pivots about a stationary pivot location on said mandrel.
6. The apparatus of claim 1, wherein:
said blade assembly comprises a blade having opposed flat surfaces where one flat surface is supported by a radial surface defining a mandrel opening for said blade and the opposed flat surface supports a lower end of the severed subterranean tubular for tandem lifting of said mandrel and said severed subterranean tubular.
7. The apparatus of claim 1, wherein:
said piston is driven in a reverse direction than flow that passes through a piston passage for extension of said blade assembly.
8. The apparatus of claim 1, wherein:
said piston comprises a piston passage that is selectively obstructed so that pressure on said piston with said piston passage obstructed retracts said blade assembly.
9. The apparatus of claim 1, wherein:
said mandrel further comprises a centralizer.
10. The apparatus of claim 2, wherein:
initial movement of said piston triggers said locking assembly to prevent reverse movement of said piston.
11. The apparatus of claim 10, wherein:
said piston is moved in a first direction so that said blade assembly is extended by flow through a piston passage that is in flow communication with said mandrel passage, said mandrel further comprising a flow restriction to create back pressure against a lower end of said piston.
12. The apparatus of claim 11, wherein:
said blade assembly pivots about a stationary pivot location on said mandrel.
13. The apparatus of claim 12, wherein:
said blade assembly comprises a blade having opposed flat surfaces where one flat surface is supported by a radial surface defining a mandrel opening for said blade and the opposed flat surface supports a lower end of the severed subterranean tubular for tandem lifting of said mandrel and said severed subterranean tubular.
14. The apparatus of claim 13, wherein:
said piston is driven in a reverse direction than flow that passes through said piston passage for extension of said blade assembly.
15. The apparatus of claim 14, wherein:
said piston passage is selectively obstructed so that pressure on said piston with said piston passage obstructed retracts said blade assembly.
16. The apparatus of claim 15, wherein:
said mandrel further comprises a centralizer.
17. The apparatus of claim 1, wherein:
said piston comprising a piston passage in fluid communication with said mandrel passage, said locking assembly defeated by pressure on said piston with said piston passage obstructed.
18. The apparatus of claim 17, wherein:
said locking assembly comprises a lock ring retained to said mandrel passage with at least one breakable member and selectively engaging a profile on said piston to prevent reversing of initial piston movement until said breakable member is defeated.
19. The apparatus of claim 15, wherein:
said locking assembly defeated by pressure on said piston with said piston passage obstructed.
20. The apparatus of claim 19, wherein:
said locking assembly comprises a lock ring retained to said mandrel passage with at least one breakable member and selectively engaging a profile on said piston to prevent reversing of initial piston movement until said breakable member is defeated.
US13/645,118 2012-10-04 2012-10-04 Cutting and pulling tool with double acting hydraulic piston Active 2034-06-15 US9366101B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US13/645,118 US9366101B2 (en) 2012-10-04 2012-10-04 Cutting and pulling tool with double acting hydraulic piston
PCT/US2013/062326 WO2014055364A1 (en) 2012-10-04 2013-09-27 Cutting and pulling tool with double acting hydraulic piston
US14/504,995 US9725977B2 (en) 2012-10-04 2014-10-02 Retractable cutting and pulling tool with uphole milling capability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/645,118 US9366101B2 (en) 2012-10-04 2012-10-04 Cutting and pulling tool with double acting hydraulic piston

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US14/504,995 Continuation-In-Part US9725977B2 (en) 2012-10-04 2014-10-02 Retractable cutting and pulling tool with uphole milling capability

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